<template>
    <div class="star" :class="starType">
        <span v-for="(itemClass,index) in itemClasses" :class="itemClass" :key="index" class="star-item"></span>
    </div>
</template>

<script>

const LENGTH = 5;
const CLS_ON = 'on';
const CLS_HALF = 'half';
const CLS_OFF = 'off';

    export default{
        props:{
            size:{
                type:Number
            },
            score:{
                type:Number
            }
        },
        data(){
            return{

            }
        },
        computed:{
            starType(){
                return 'star-' +this.size
            },
            itemClasses(){
                let result = []
                let score = Math.floor(this.score*2)/2//取0.5的算法
                let hasDecimal = score % 1 !==0
                let integer = Math.floor(score)
                for(let i = 0;i<integer;i++){
                    result.push(CLS_ON)
                }
                if(hasDecimal){
                    result.push(CLS_HALF)
                }
                while(result.length<LENGTH){
                    result.push(CLS_OFF);
                }
                return result;

            }
        }
    }
</script>

<style lang="stylus" scoped>
@import '../../common/stylus/mixin.styl';
    
    .star
        font-size 0
        .star-item
            display inline-block
            background-repeat no-repeat
        //还是star下面的class    又有star 又有star-48
        //这个样式结构有点牛皮的
        &.star-48
            .star-item
                width 20px
                height 20px
                margin-right 22px
                background-size 20px 20px
                &last-child
                    margin-right 0px
                &.on
                    bg-image('star48_on')
                &.half
                    bg-image('star48_half')
                &.off
                    bg-image('star48_off')        
        &.star-36
            .star-item
                width 15px
                height 15px
                margin-right 6px
                background-size 15px 15px
                &last-child
                    margin-right 0px
                &.on
                    bg-image('star36_on')
                &.half
                    bg-image('star36_half')
                &.off
                    bg-image('star36_off')    
        &.star-24
            .star-item
                width 10px
                height 10px
                margin-right 4px
                background-size 10px 10px
                &last-child
                    margin-right 0px
                &.on
                    bg-image('star24_on')
                &.half
                    bg-image('star24_half')
                &.off
                    bg-image('star24_off')    

</style>

